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If it has over 100k miles, the exhaust manifolds are probably cracked. Easy solution is to buy jba long tube headers. Mine took all day to do, but it wasn't too bad compared to other jobs I've done.

Mode door actuators for the heater start clicking and go bad, but they are about $35, and easy to replace. I did the front and the rear ones.

Rear airbags for suspension leak on older trucks. I replaced mine with aftermarket shocks and springs.

I drive mine like it's a rental car, and never had an engine or transmission issue. It has a lot of miles
 
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